When it comes to royal protocol, Markle doesn't always follow the rules. And, while denim isn't often on display during royal appearances, Markle's black jeans have made their international mark by improving the lives of countless women in Cambodia, as sudden demand has boosted production beyond expectations.

Designed by Outland Denim, these jeans are made by women who have escaped human trafficking or who are at risk of falling into poverty. Outland Denim provides these women with a living wage so they can get their lives back on track and pursue the future they deserve. Outland also promises ethically and environmentally sound raw materials, combining two of Markle's greatest passions — feminism and sustainability.

As Outland Denim wrote on Instagram, "We cannot think of a more suitable woman to carry the Outland Denim brand."

Outland Denim later tweeted its gratitude and announced its life-changing expansion, which came as a direct result of Markle's fashion choice: "Thanks to the Duchess' choice in denim, we're pleased to announce that it will be possible to employ a further 15 to 30 seamstresses in our Cambodian production house in the coming weeks, and the recruitment process has already begun."

"This quiet, dignified, but determined support for our brand — and the humanitarian cause it represents — means the world to us, to our beautiful seamstresses, and to the 15 young women who are now feeling the empowerment of employment thanks to the 'Markle Effect'! Meghan's [modeling] of positive change through the power of fashion sets a precedent for all other people with a public profile."

Markle's footwear also represents another "step" in the right direction, as both her sneakers and her flats are made from recycled materials that promote a sustainable environment.

While sailing, for instance, Markle ditched her signature stilettos for Veja sneakers. The French company specializes in minimalist, ecological sneakers that are packaged by individuals who've been struggling to find work, including those who were previously incarcerated.

According to Fast Company: "The cotton comes from an organic farm in Brazil, where workers don’t have to worry about harmful pesticides poisoning their villages. The rubber is tapped by people in the Amazon using traditional techniques. The brand tries to use the most sustainable uppers possible, including the skin of the tilapia fish and a leather-like material made from curdled milk."

During her time on the beach in Melbourne, Markle traded her heels, once again, for something more practical. This time, she donned black flats by Rothy's, which are made from recycled water bottles. Established at a time when sustainability was just beginning to gain traction, Rothy's blends its environmentally conscious approach with the desire to make sustainable fashion attractive and affordable for the masses.

According to Rothy's site, on a global scale, 91 percent of plastic does not get recycled. However, the company has repurposed more than 18 million water bottles to date. Rothy's has also partnered with Americares to donate all samples and returns to women who would otherwise go without. Thus far, Rothy's has donated 15,000 pairs of shoes to women in need. Once again, this company also promotes sustainability and supports women in ways that align with Markle's established beliefs.

While delivering an empowering speech to celebrate the 125th anniversary of women's suffrage in New Zealand, Markle wore a black dress from the feminist designer Gabriela Hearst. Heart's sustainable designs assure consumers that all materials have been ethically sourced.

As Hearst's website notes, the Uruguay-born, New York-based designer wanted to "make a strong and modern collection without compromising her ethics and key values, taking into consideration where materials come from and who is making them: luxury with a conscience or, in other words, 'honest luxury.'"

Considering Markle has never been one to compromise her own ideals, it's no wonder she's embraced numerous brands that blend their devotion to the environment with their support for women. And, even though the Royal Tour has almost come to an end, it will be exciting to see how Markle blends her morals with her maternity wardrobe in the months to come.